/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.*;
import axescon.xacml.model.shared.attr.BooleanAttribute;
import axescon.xacml.model.shared.attr.IntegerAttribute;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implements n-of from
 *         axescon.xacml 2.0 ch. A3.15 Logical Functions
 */
public class FnLogicalNOf extends AbstractFn {

    public Liquid exec(Liquid[] args) throws ExpressionEvalIndeterminateException {
        int n = (int) ((IntegerAttribute) args[0].getSingularUnsafe()).getValue();
        if (n > args.length - 1)
            throw new ExpressionEvalIndeterminateException("FnLogicalNOf: n: " + n + " is too big for no of args:" + args.length);
        for (int i = 1; i < args.length; i++) {
            if (((BooleanAttribute) args[i].getSingularUnsafe()).getValue()) n--;
            if (n == 0) return new Liquid(new BooleanAttribute(true));
        }
        return new Liquid(new BooleanAttribute(false));
    }


    public int getArgTypeListLength() {
        return 2;
    }

    public int getMaxArgListLength() {
        return -1;
    }

    public int getMinArgListLength() {
        return 1;
    }

    public Class getReturnDataType() throws ExpressionEvalIndeterminateException {
        return BooleanAttribute.class;
    }

    {
        dataTypes = new Class[]{IntegerAttribute.class,BooleanAttribute.class};
    }

}
